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| Marine Resource Fact Sheet |
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| Red mullet - Northern Spain, 2004 |
 | Mullus barbatus - Northern Spain |
| | Owned by | General Fisheries Commission for the Mediterranean (GFCM)
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| Main Descriptors | Considered a single stock: Yes
Spatial Scale: Sub-Regional
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| Considered a single stock: A group of individuals in a species occupying a well defined spatial range independent of other stocks of the same species. It can be affected by random dispersal movements and directed migrations due to seasonal or reproductive activity. |
| Spatial Scale: Spatial scale contains a standard term such as Global, Regional (e.g. for the whole Atlantic), sub-regional (e.g. for a part of the Atlantic), national, local (for sub-national levels). |
| Considered a management unit: An aquatic resource or fishery is
declared as [Fishery] Management Unit if it is
effectively the focus for the application of selected
management methods and measures, within the broader
framework of a management system. According to the FAO
Glossary for Responsible Fishing, "a Fishery Management
Unit (FMU) is a fishery or a portion of a fishery
identified in a Fishery Management Plan (FMP) relevant
to the FMP's management objectives." FMU's may be
organised around fisheries biological, geographic,
economic, technical, social or ecological dimensions ,
and the makeup and attribute of a fishery management
unit depends mainly on the FMP's management
objectives. |
| Jurisdictional distribution: Jurisdictional qualifier (e.g.
"shared", "shared - highly migratory") of the aquatic
resource related with its spatial distribution. |
| Environmental group: Classification of the aquatic
resource according to the environmental group (e.g.
pelagic invertebrate, or demersal fish) to which the
species belong. |
| | | | | | Habitat and Biology Climatic zone: Temperate. Bottom type: Soft bottom. Depth zone: Shelf. Horizontal distribution: Neritic; Littoral. Vertical distribution: Demersal/benthic. Geographical Distribution Jurisdictional distribution: Straddling between High Seas and EEZ Water Area Overview Spatial Scale: Sub-Regional Balearic Geo References  | | Distribution of Red mullet - Northern Spain
| GFCM geographical sub-areas | 6: Northern Spain |
| | | | | | Other georeferences
| FAO Fishing Statistical Division Areas | 37.1.1: Balearic |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Red mullet - Northern Spain Resource Structure Considered a single stock: Yes Exploitation Red mullet ( Mullus barbatus) is one of the target species of the trawl fishery in the GSA 06. The trawl fleet operating in this area is composed by 647 boats averaging 47 TRB, 58 GT and 297 HP.
Some of these units (smaller vessels) operate almost exclusively on the continental shelf, targeting red mullet, octopus and sea breams. According to official data, landings increased considerably between 1973 and 1982 and from this year until now a decreasing trend has been observed. The average landings of this species in the period 1998-2005 reached 1291 t. Assessment Assessment Model VPA, tunned with standardised CPUE from the commercial fleet and abundance indices from MEDITS and LEDER trawl surveys. The Extended Survivor Analysis (XSA) method (Lowestoft programme; Darby and Flatman, 1994) and Yield-per-recruit (Y/R) analysis (VIT programme; Lleonart and Salat, 1992) on a mean pseudo-cohort 1998-2004 was also applied. Methodology The state of exploitation was assessed by VPA, tunned with standardised CPUE from the commercial fleet and abundance indices from MEDITS and LEDER trawl surveys. The Extended Survivor Analysis
(XSA) method (Lowestoft programme; Darby and Flatman, 1994) and Yield-per-recruit (Y/R) analysis (VIT programme; Lleonart and Salat, 1992) on a mean pseudo-cohort 1998-2004 was also applied. Both methods were performed using size composition of trawl catches from 1998 to 2005. Biological parameters of growth and maturity were the same used in previous assessments, but a M-at-age vector has been used in the current assessment. Transition analysis was carried out considering two different management strategies aimed at improving the state of this resource: (1) a 20% reduction in current effort and (2) a change of mesh type in cod-end, from the current 40 mm diamond shape to 40 mm square. Overall Assessment Results Results of LCA show a growth overfishing, with Fmax = 0.26 as a factor of current F. Important
increment in Y/R could be obtained reducing fishing effort but, specially, with the use of square mesh in the cod-end. Scientific Advice Management advice and recommendations: Important increment in Y/R could be
obtained reducing fishing effort by 20% and/or with the use of square mesh in the cod-end. Biological State and Trend Exploitation state: Overexploited Growth overexploitation. Source of information “Stock assessment of red mullet (Mullus barbatus) from the trawl fishery off the Geographical Sub-Area 06 (Northern Spain). In: Report of the eight session of the Sub-Commitee on Stock Assessment (SCSA)” . A.M. Fernández, M. García-Rodríguez, J. L. Pérez Gil, A. Esteban. FAO-GFCM Rome, Italy, 11-14 September 2006 FAO  . |
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